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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>021-SVG路径-实例2-二次方贝塞尔曲线</title>
</head>

<body>
    <!-- 创建了一个二次方贝塞尔曲线，A 和 C 分别是起点和终点，B 是控制点 -->
    <svg xmlns="http://www.w3.org/2000/svg" version="1.1" height="400" width="450">
        <path id="lineAB" d="M 100 350 l 150 -300" stroke="red" stroke-width="3" fill="none" />
        <path id="lineBC" d="M 250 50 l 150 300" stroke="red" stroke-width="3" fill="none" />
        <path d="M 175 200 l 150 0" stroke="green" stroke-width="3" fill="none" />
        <path d="M 100 350 q 150 -300 300 0" stroke="blue" stroke-width="5" fill="none" />
        <!-- Mark relevant points -->
        <g stroke="black" stroke-width="3" fill="black">
            <circle id="pointA" cx="100" cy="350" r="3" />
            <circle id="pointB" cx="250" cy="50" r="3" />
            <circle id="pointC" cx="400" cy="350" r="3" />
        </g>
        <!-- Label the points -->
        <g font-size="30" font="sans-serif" fill="black" stroke="none" text-anchor="middle">
            <text x="100" y="350" dx="-30">A</text>
            <text x="250" y="50" dy="-10">B</text>
            <text x="400" y="350" dx="30">C</text>
        </g>
    </svg>

    <!-- 复杂吗？是的！！由于在绘制路径时的复杂性，强烈建议使用SVG编辑器来创建复杂的图形。 -->
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